Sometimes, despite all best efforts, a cut can fail. USB connection, chain slippage, whatever. This may seem like the most basic of tips to save things, but after reading a few threads recently, I thought worth sharing.
When you set define home for your cut, use the Z-axis control and drill a hole; if you need to resume a cut, this is your known zero. I’ve found that if I reset my chains knowing the mm X Y start it’s sometimes off; but manually jogging till your bit can CLEANLY enter and exit that known zero always helps.
I hope this helps just one person - saved me a few times now